core: support configurable event loop mechanism #9899

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	13m 32s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	13m 37s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	13m 3s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	12m 51s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	13m 4s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	14m 14s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	13m 14s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	13m 32s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	13m 18s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	13m 3s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	46m 14s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	12m 47s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	12m 50s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	12m 55s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	12m 56s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	12m 0s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	12m 40s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	13m 3s
Unit tests (matrix)	1s
	4h 28m 54s

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